Liquid fuel burning heaters

ABSTRACT

A LIQUID FUEL BURNING HEATER HAVING WICK FED RADIANT BURNER OF THE &#34;SHORT DRUM&#34;F TYPE, IS PROVIDED WITH AN EXTINGUISHING DEVICE WHICH IS OPERATIVE, UPON TILTING OF THE HEATER, TO RETRACT THE WICK AND CLOSE THE SPACE BETWEEN THE INNER AND OUTER WICK TUBES UNDER THE INFLUENCE OF A SPRING ACTING UPON A ROD, THE UPPEREND OF WHICH IS SECURED TO THE EXTINGUISHING DEVICE AND THE LOWER END OF WHICH ENGAGES THE GROUND WHEN THE HEATER IS STANDING UPRIGHT.

June 27, 1972 H H AR 3,672,809

LIQUID FUEL BURNING HEATERS Filed Feb. 12, 1971 2 Sheets-Sheet 1 19 FIG.7. M

16 I0 15*") l 12 v '0.0OIOOO Oo;;OO O O 0 I 0 O b 0 0 0 0 0 0 0 0 090 02 INVENTOR HUGH CHARLES HEBARD tfil nw'v BY NORRIS & BATEMAN June 27, cHEBARD LIQUID FUEL BURNING HEATERS 2 Sheets-Sheet 2 Filed Feb. 12, 1971FIG. 3.

OOOOOOqOO INVENTOR HUGH CHARLES HEBARD 4 (4 n/I BY NORRIS S: BATEMANUnited States Patent Oflice 3,672,809 Patented June 27, 1972 3,672,809LIQUID FUEL BURNING HEATERS Hugh Charles Hebard, Buchinghamshire,England, assignor to Aladdin Industries Limited, Greenford, Middlesex,England Filed Feb. 12, 1971, Ser. No. 114,972 Claims priority,applicatjgn77Gsrleat Britain, Sept. 21, 1970,

Int. Cl: nzsa 3/26 US. Cl. 431-34 8 Claims ABSTRACT OF THE DISCLOSUREThis invention relates to liquid fuel burning heaters of the kind havinga radiant burner of the short drum type, the output of which iscontrolled by raising and lowering the wick, and the principal object ofthe invention is to provide a heater of this kind with a mechanicallyoperated device which serves to effectively extinguish the burner whenthe heater is tilted or overturned.

In conventional heaters of this kind a cylindrical wick connected to theusual wick raising mechanism is concentrically arranged in the annularspace between a fixed inner wick tube provided at its upper end with aninwardly turned flange upon which rests the inner perforated shell of ashort drum burner and a fixed outer wick tube provided at its upper endwith an outwardly turned flange upon which rests the outer perforatedshell of the burner. The diameter of the wick is thus approximatelyequal to the mean diameter of the two burner shells.

In accordance with the present invention, a liquid fuel burning heatercomprises a radiant burner of the short drum type having concentricperforated shells, the outer one of which extends downwardly for agreater distance than the inner one, and a wick, the diameter of whichis no greater than that of the inner burner shell, vertically movablerelative to the burner in the annular space between an outer wick tubehaving an outwardly turned flange at its upper end for engagement by theouter burner shell and an inner wick tube consisting of a fixed lowerportion and an upper portion slidably mounted on said lower portion andoperatively connected to said wick, said movable upper portion of theinner wick tube being provided at its upper end with an annular flangewhich overlies the space between said wick tubes and engages the lowerend of the inner burner shell in the operative position of the burnerand with a perforated cover plate secured to the upper end of a rodwhich normally extends into engagement with the surface on which theheater stands and, upon tilting of the heater, is spring urgeddownwardly to lower said movable wick tube portion and the wick untilthe annular flange closes the upper end of the space between the Wicktubes and isolates the wick from the burner.

A preferred form of the invention will be described, by way of example,with reference to the accompanying drawings in which:

FIG. 1 is a section through the heater in its operative condition;

FIG. 2 is a view of a detail of FIG. 1 on an enlarged scale; and

FIG. 3 is a view similar to FIG. 2 showing the movable wick tube portionin elevation and the parts in the positions taken up upon tilting of theheater.

The heater shown in the drawings comprises a burner 1 of the short drumtype, a cylindrical wick 2 which passes through the annular spacebetween an inner Wick tube, comprising a fixed lower portion 3 and amovable upper portion 4, and a fixed outer wick tube 5 into the wellportion 6 of a non-spill tank of the kind described in British patentspecification No. 1,001,029, having an outer compartment 7 provided witha closable vent (not shown) and communicating with the bottom of thewell through a small hole 8 and an upper compartment 9 communicatingwith the upper end of the well and of sufficient volume to contain allthe oil from the well when the heater is overturned.

The burner 1 includes an outer perforated shell 10 which rests on aflange 11 secured to the upper end of the wick tube 5, an innerperforated shell 12 which ends short of the shell 10 and rests on aflange 13 on the upper end of the movable portion 4 of the inner wicktube when the heater is in its operative position shown in FIGS. 1 and 2and a draught shield 14 which is secured to the shells 10 and 12 bycross-bars 15 and 16. The upper end of the shell 12 is closed except fora central aperture 17 and is surmounted in conventional manner by aplate 18 surrounded by a Wire coil 19 above which is mounted aconventional gauze dome 20.

The movable portion 4 of the inner wick tube includes a perforated part21 of reduced diameter which slides on the upper end of the fixedportion 3 and a skirt portion 22 of larger diameter which slidablyengages the inner surface of the wick 2 and is formed with helical slots23 (FIG. 3) through which pass studs 24 secured to the wick. The upperend of the movable portion 4 of the inner wick tube is covered by aperforated plate 25 integral with the flange r13 and secured by screws26. A rod 27 secured at its upper end to the plate 25 is provided at itslower end with a foot 28 adapted to project through an aperture 29 inthe base 30 into engagement with the surface upon which the heaterstands and carrying a handle 31, rotation of which acts through the part4, helical slots 23 and studs 24 to raise or lower the wick 2 relativeto the wick tubes. The rod 27 is urged in a downward direction by aspring 32 acting between the foot 28 and the top 33 of a central tubedefined by the intersecting portions of vanes 34 on the inner surface ofthe wick tube 3, the outer surface of which is provided with vanes 35which co-operate with the studs 24 to prevent the wick from rotatingwhen the handle 31 is turned.

In normal operation contact between the supporting surface and the foot28 maintains the flange 13 in contact with the inner burner shell 12,but when the heater is lifted or tilted the spring 32 acts through therod 27 to urge the movable portion 4 of the inner wick tube downwards tothe position shown in FIG. 3 in which the outer edge of the flange 13contacts the top edge of the outer Wick tube 5 and the inner edge of theflange 13 engages the upper edge of the fixed part '3' of the inner wicktube. At the same time the top edges of the slots 23 co-operate with thestuds 24 to push the wick 2 downward to a cooler part of the heaterwhere it is effectively sealed from the space between the burner shells10 and 12. These features combined with the use of the non-spill tankensure effective extinction of the burner flame if the heater is tiltedor overturned.

I claim:

1. A liquid fuel burning heater of the kind having a radiant burner ofthe short drum type, the output of which is controlled by raising andlowering a cylindrical wick concentrically arranged in the annular spacebetween inner and outer wick tubes, said heater being provided 3 with anextinguishing device operable automatically when the heater is tilted oroverturned, to lower the wick within said annular space and isolate thelatter from the burner.

2. A heater according to claim 1, wherein said extin-guishing device isslidably mounted on the inner wick tube in operative connection with thewick, is supported in its inoperative position by a member extendinginto engagement with the surface on which the heater stands and is urgedtowards its operative position by a spring.

' 3. A heater according to claim 1, wherein said extinguishing device isa tube, the upper end of which is covered by a perforated cover plateand provided with an external flange which, in the operative position ofthe device, closes the upper end of said annular space and, in theinoperative position of the device, engages the lower end of the shorterof two perforated burner shells, the longer of which rests upon anout-turned flange at the upper end of the outer wick tube.

4. A liquid fuel burning heater comprising a radiant burner of the shortdrum type having concentric perforated shells, the outer one of whichextends downwardly for a greater distance than the inner one, and awick, the diameter of which is no greater than that of the inner burnershell, vertically movable relative to the burner in the annular spacebetween an outer wick tube having an outwardly turned flange at itsupper end for engagement by the outer burner shell and an inner wicktube consisting of a fixed lower portion and an upper portion slidablymounted on said lower portion and operatively connected to said wick,said movable upper portion of the inner wick tube being provided at itsupper end with an annular flange which overlies the space between saidwick tubes and engages the lower end of the inner burner shell 'in theoperative position of the burner and with a perforated cover platesecured to the upper end of a rod which 4 normally extends intoengagement with the surface on which the heater stands and, upon tiltingof the heater, is spring urged downwardly to lower said movable wicktube portion and the wick until the annular flange closes the upper endof the space between the wick tubes and isolates the wick from theburner.

5. A heater according to claim 4, wherein said movable wick tube portionhas an upper perforated portion in sliding contact with said fixed wicktube portion anda larger diameter skirt portion in sliding engagementwith the inner surface of the wick.

6. A heater according to claim 5, wherein said skirt portion is formedwith helical slots which receive studs secured to the wick and said rodis rotatable about its axis to raise and lower the wick through themedium of said co-operating studs and slots.

-'7. A heater according to claim 6, wherein radial vanes on said fixedinner wick tube portion cooperates with said studs to prevent the wickfrom rotating with said movable wick tube portion.

8. A heater according to claim 1, wherein the lower end of the wickenters the well portion of a non-spill tank.

References Cited UNITED STATES PATENTS 921,633 5/ 1909 Stokes et al43134 2,18 8,577 1/1940 Richardson 431-329 3,237,678 3/1966 Haruro Sumaet al. 43134 3,279,222 10/ 1966 Hebard 43188 CARROLL B. DORITY, 111.,Primary Examiner US. Cl. X.R. 43 l-304

